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Investments (Available-For-Sale Fixed Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Reclassifications from AOCI to net income (loss):
Amortized Cost	$ 3,850,889	$ 2,361,575
Allowance for Expected Credit Losses	0	552	$ 552	$ 1,408	$ 0
Gross Unrealized Gains	67,565	99,936
Gross Unrealized Losses	14,318	3,428
Estimated Fair Value	3,904,136	2,457,531
U.S. Treasury obligations
Reclassifications from AOCI to net income (loss):
Amortized Cost	241,696	104,097
Allowance for Expected Credit Losses		0
Gross Unrealized Gains	1,681	2,985
Gross Unrealized Losses	672	23
Estimated Fair Value	242,705	107,059
U.S. Government-sponsored enterprise obligations
Reclassifications from AOCI to net income (loss):
Amortized Cost	20,509	12,103
Allowance for Expected Credit Losses		0
Gross Unrealized Gains	57	158
Gross Unrealized Losses	98	0
Estimated Fair Value	20,468	12,261
State and municipal bonds
Reclassifications from AOCI to net income (loss):
Amortized Cost	513,111	316,022
Allowance for Expected Credit Losses		0
Gross Unrealized Gains	11,155	16,937
Gross Unrealized Losses	1,559	39
Estimated Fair Value	522,707	332,920
Corporate debt
Reclassifications from AOCI to net income (loss):
Amortized Cost	1,928,543	1,267,992
Allowance for Expected Credit Losses	0	552	$ 552	$ 1,408	$ 0
Gross Unrealized Gains	41,493	63,204
Gross Unrealized Losses	6,923	1,302
Estimated Fair Value	1,963,113	1,329,342
Residential mortgage-backed securities
Reclassifications from AOCI to net income (loss):
Amortized Cost	475,368	269,752
Allowance for Expected Credit Losses		0
Gross Unrealized Gains	5,513	7,171
Gross Unrealized Losses	2,972	382
Estimated Fair Value	477,909	276,541
Agency commercial mortgage-backed securities
Reclassifications from AOCI to net income (loss):
Amortized Cost	14,531	12,623
Allowance for Expected Credit Losses		0
Gross Unrealized Gains	460	687
Gross Unrealized Losses	49	0
Estimated Fair Value	14,942	13,310
Other commercial mortgage-backed securities
Reclassifications from AOCI to net income (loss):
Amortized Cost	216,595	109,244
Allowance for Expected Credit Losses		0
Gross Unrealized Gains	3,545	4,788
Gross Unrealized Losses	1,116	940
Estimated Fair Value	219,024	113,092
Other asset-backed securities
Reclassifications from AOCI to net income (loss):
Amortized Cost	440,536	269,742
Allowance for Expected Credit Losses		0
Gross Unrealized Gains	3,661	4,006
Gross Unrealized Losses	929	742
Estimated Fair Value	$ 443,268	$ 273,006

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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